Grinding and polishing implement



T. B. STONE. Grinding and Polishing Implement,

No. 223,771. Patented Jan. 20, 1880.

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UNITED STATES PATENT OFFICE.

TUCKER B. STONE, ST. LOUIS, MISSOURI.

.GRINDI NG AND POLISHING IMPLEMENT.

SPECIFICATION formingpart of Letters Patent No. 223,771, dated January 20, 1880.

Application filed September 19, 1879.

To all whom it may concern Be it known that I, TUCKER B. STONE, of St. Louis, in the county of St. Louis and State of Missouri, have invented certain Improvements in Grinding and Polishing Implements, ofwhich the following is a specification.

This invention relates to tools for grinding and polishing; and it consists in the combination of certain materials found in nature,

which, after due process, are to be molded into the shapes required, and afterward properly hardened in a furnace, all of which will be hereinafter more fully described, and set forth in the claim.

The principal substance used in the following compound is known in mineralogy as itacolumite, which is commonly called flexible sandstone. Its analysis shows the following ingredients and their proportions, viz: bort, sixty-seven per cent; silica, twenty-eight per cent; mica, two per cent; and water of crystallization, three per cent.

I take the following substances, which may be broken up in small pieces, so that they will be readily fused, viz: one part of feldspar, one part of saltpeter, three parts of borax, two parts of sand, and three parts of soda-ash. These ingredients are to be'mixed thoroughly in a crucible and melted, so as to form one mass, after which the mass is allowed to cool, and then pulverized to the degree of fineness required for the grit of the tool to be used for grinding or polishing, to make the coarse or very fine polishing-tool. This pulverized material is then to be mixed with eighty parts 3 5 of the itacolumite, which had been previously reduced to a powder similar in fineness to that of the other. When these have been thoroughly incorporated the mass is to be moistened in molds of the proper form, such as shown in the drawings, Figures 1,2,and 3, and such pressure is to be applied as may be necessary to compress the mass to the firmness which may be requisite. then placed in a suitable furnace until the tool is sufficiently baked. After cooling the same it is ready for use. This material can be molded into any shape for polishing, grinding or reducing surfaces, plain or molded.

Grinding-stones may be made of any size or hardness, and of all grades of fine or coarse, as the work may require.

I claim- Implements for reducing, grinding, and pol- 5 5 ishing surfaces, composed of a mixture of the following materials, and of approximate pro portions as follows: one part each of feldspar and saltpeter, two parts of sand, and three with water sufficiently to permitit to be tamped 40 The material thus molded is 5 parts each of borax and soda-ash, and eighty parts of pulverized itacolumite, substantially as and for the purpose described.

TUCKER B. STONE. Witnesses:

F. S. MACK, It. B. WASHINGTON, Jr. 

